1Z0-060 · Question #192
Which two statements are true about Oracle Direct Network File System (NFS)?
The correct answer is C. Oracle Database requires mount points to be mounted by the kernel NFS system even when E. Direct NFS performs load balancing across all specified paths. If a specified path fails, Direct NFS. Oracle Direct NFS bypasses the OS file system cache and performs automatic load balancing with path failover, but still requires kernel NFS mounts for directory-level operations.
Question
Which two statements are true about Oracle Direct Network File System (NFS)?
Options
- ADirect NFS can use only the oranfstab configuration file located in $ORACLE_HOME/dbs/.
- BIt utilizes the operating system file system cache.
- COracle Database requires mount points to be mounted by the kernel NFS system even when
- DThe Oracle database files available on the NFS server that are served by the Direct NFS Client
- EDirect NFS performs load balancing across all specified paths. If a specified path fails, Direct NFS
How the community answered
(50 responses)- A2% (1)
- B6% (3)
- C88% (44)
- D4% (2)
Why each option
Oracle Direct NFS bypasses the OS file system cache and performs automatic load balancing with path failover, but still requires kernel NFS mounts for directory-level operations.
Direct NFS searches for an oranfstab file in multiple locations - $ORACLE_HOME/dbs/, /var/opt/oracle/, and /etc/ - not exclusively in $ORACLE_HOME/dbs/.
Direct NFS explicitly bypasses the operating system file system cache and manages its own I/O path directly to the NFS server; this cache bypass is one of its primary performance advantages.
Even with Direct NFS enabled, Oracle Database requires the NFS paths to remain mounted by the kernel NFS client, because directory-level operations such as file creation and metadata lookups depend on the kernel mount rather than the Direct NFS I/O path.
Files accessed through the Direct NFS client use Oracle's own internal NFS stack and are not directly visible or accessible to standard OS-level utilities in the same way as files on a kernel-NFS-mounted path.
Direct NFS distributes I/O across all network paths defined in the oranfstab configuration file and automatically redirects traffic to remaining healthy paths if one path fails, providing both throughput and resilience.
Concept tested: Oracle Direct NFS client caching behavior, kernel mount requirement, and path failover
Source: https://docs.oracle.com/en/database/oracle/oracle-database/19/cwlin/about-direct-nfs-client-mounts-to-nfs-storage-devices.html
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